ExpandableListView实例(一)_数据库增删改查处理和listitem点击长按处理

本例说明:

1.实例中表现层与数据处理层分开,代码可复用性强,如果能看懂代码对算法会有提高.

2.组和子条目上"点击"事件处理,能够区分操作的是组还是子条目,并且得到组和子条目的内容.

3.组和子条目上"长按"事件处理,能够区分组和子条目,并且得到组和子条目的内容.

4.自定义条目样式,灵活与数据库中字段绑定.

5.实现对DB的增删改查,并且操作后自动刷新.

6.使用数据库处理框架AHibernate灵活操作sqlite数据库,详见: http://blog.csdn.net/lk_blog/article/details/7455992

效果图:

主要代码:

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btnAdd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="初始化数据" />

    <Button
        android:id="@+id/btnClear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="清空数据" />

    <ExpandableListView
        android:id="@+id/expList"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

list_group.xml:

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/group"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/groupIdTo"
        android:visibility="gone" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

    <TextView
        android:id="@+id/groupNameTo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingBottom="10px"
        android:paddingLeft="30px"
        android:paddingTop="10px"
        android:text="No data"
        android:textSize="26sp" />
</LinearLayout>

list_child.xml:

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/child"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/childIdTo"
        android:visibility="gone" 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />

    <TextView
        android:id="@+id/childNameTo"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="5px"
        android:paddingLeft="50px"
        android:paddingTop="5px"
        android:text="No data"
        android:textSize="20sp" />
</LinearLayout>

GroupChild.java:(用于存放数据库中取出的内容)

package com.tgb.lk.demo.util;

public class GroupChild {
	public String groupId;
	public String groupName;
	public String childId;
	public String childName;

	public GroupChild() {
	}

	public String getGroupId() {
		return groupId;
	}

	public void setGroupId(String groupId) {
		this.groupId = groupId;
	}

	public String getGroupName() {
		return groupName;
	}

	public void setGroupName(String groupName) {
		this.groupName = groupName;
	}

	public String getChildId() {
		return childId;
	}

	public void setChildId(String childId) {
		this.childId = childId;
	}

	public String getChildName() {
		return childName;
	}

	public void setChildName(String childName) {
		this.childName = childName;
	}

	@Override
	public String toString() {
		return "GroupChild [childId=" + childId + ", childName=" + childName
				+ ", groupId=" + groupId + ", groupName=" + groupName + "]";
	}

}

GroupChildUtil.java:(这里是构建数据的核心代码,看懂这里对算法有提高哦)

package com.tgb.lk.demo.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import com.tgb.lk.expandable.R;

import android.content.Context;
import android.text.TextUtils;
import android.widget.SimpleExpandableListAdapter;

public class GroupChildUtil {
	// 组布局文件id
	private static int groupLayout = R.layout.list_group;
	// 内容布局文件id
	private static int childLayout = R.layout.list_child;
	// 绑定的组Id的名字
	public static String groupIdFrom = "group_id";
	// 绑定的组name的名字
	public static String groupNameFrom = "group_name";
	// 绑定的内容Id的名字
	public static String childIdFrom = "child_id";
	// 绑定的内容Name的名字
	public static String childNameFrom = "child_name";
	// 组Id绑定控件Id
	private static int groupIdTo = R.id.groupIdTo;
	// 内容Id绑定控件的Id
	private static int childIdTo = R.id.childIdTo;
	// 组名称绑定的控件Id
	private static int groupNameTo = R.id.groupNameTo;
	// 内容Id绑定的控件Id
	private static int childNameTo = R.id.childNameTo;

	public static SimpleExpandableListAdapter buildAdapter(Context context,
			List<GroupChild> groupChildData) {
		//定义构建Adpater的组要用的组数据.
		List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();
		//定义构建Adpater的子条目要用的组数据.
		List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();
		//LinkedHashMap会根据添加时顺序存放数据.
		Map<Map<String, String>, List<Map<String, String>>> tempMap = new LinkedHashMap<Map<String, String>, List<Map<String, String>>>();
		if (groupChildData != null && groupChildData.size() > 0) {
			for (int i = 0; i < groupChildData.size(); i++) {
				GroupChild gc = groupChildData.get(i);
				Map<String, String> groupMap = new HashMap<String, String>();
				Map<String, String> childMap = new HashMap<String, String>();

				groupMap.put(groupIdFrom, gc.getGroupId());
				groupMap.put(groupNameFrom, gc.getGroupName());
				if (TextUtils.isEmpty(gc.getChildId())
						&& TextUtils.isEmpty(gc.getChildName())) {
					childMap = null;
				} else {
					childMap.put(childIdFrom, gc.getChildId());
					childMap.put(childNameFrom, gc.getChildName());
				}
				//tempMap的key是组,value是组中包含的子条目List.
				if (tempMap.containsKey(groupMap)) {
					if (childMap != null) {
						tempMap.get(groupMap).add(childMap);
					}
				} else {
					List<Map<String, String>> tempList = new ArrayList<Map<String, String>>();
					if (childMap != null) {
						tempList.add(childMap);
					}
					tempMap.put(groupMap, tempList);
				}
			}
		}
		//循环map,得到最终的group和child.
		for (Map<String, String> key : tempMap.keySet()) {
			groupData.add(key);
			childData.add(tempMap.get(key));
		}

		SimpleExpandableListAdapter sela = new SimpleExpandableListAdapter(
				context, groupData, groupLayout, new String[] { groupIdFrom,
						groupNameFrom }, new int[] { groupIdTo, groupNameTo },
				childData, childLayout, new String[] { childIdFrom,
						childNameFrom }, new int[] { childIdTo, childNameTo });
		return sela;
	}
}

StudentDaoImpl.java:(数据库中查找到记录并保存为GroupChild对象,用户构建ExpandableListView)

package com.tgb.lk.demo.dao.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.tgb.lk.ahibernate.dao.impl.BaseDaoImpl;
import com.tgb.lk.demo.dao.StudentDao;
import com.tgb.lk.demo.model.Student;
import com.tgb.lk.demo.util.DBHelper;
import com.tgb.lk.demo.util.GroupChild;

import android.content.Context;

//本文数据库处理引用jar包AHibernate处理.
//AHibernate的详细使用教程示例地址: http://blog.csdn.net/lk_blog/article/details/7455992
//AHibernate源码交流地址: http://blog.csdn.net/lk_blog/article/details/7456125
//AHibernate jar包下载及源代码下载地址: http://download.csdn.net/detail/lk_blog/4222048
public class StudentDaoImpl extends BaseDaoImpl<Student> implements StudentDao {
	public StudentDaoImpl(Context context) {
		super(new DBHelper(context));
	}

	//查出数据,List中存放GroupChild对象.
	public List<GroupChild> getData() {
		String sql = "select s._id sid,s.name sname,c._id cid,c.name cname from t_student s "
				+ " join t_classes c on s.classesid=c._id";
		List<Map<String, String>> list = super.query2MapList(sql, null);
		List<GroupChild> retList = new ArrayList<GroupChild>();
		for (Map<String, String> map : list) {
			GroupChild gc = new GroupChild();
			gc.setChildId(map.get("sid"));
			gc.setChildName(map.get("sname"));
			gc.setGroupId(map.get("cid"));
			gc.setGroupName(map.get("cname"));
			retList.add(gc);
		}

		return retList;
	}
}

MainActivity.java:

package com.tgb.lk.expandable;

import java.util.HashMap;
import java.util.List;

import com.tgb.lk.demo.dao.ClassesDao;
import com.tgb.lk.demo.dao.StudentDao;
import com.tgb.lk.demo.dao.impl.ClassesDaoImpl;
import com.tgb.lk.demo.dao.impl.StudentDaoImpl;
import com.tgb.lk.demo.model.Classes;
import com.tgb.lk.demo.model.Student;
import com.tgb.lk.demo.util.GroupChild;
import com.tgb.lk.demo.util.GroupChildUtil;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;
import android.widget.ExpandableListView.OnChildClickListener;

public class MainActivity extends Activity {
	private static final int ITEM_MODIFY = 0;
	private static final int ITEM_DELETE = 1;
	private Button btnAdd = null;
	private Button btnClear = null;
	private StudentDao studentDao = null;
	private ClassesDao classesDao = null;
	private ExpandableListView expList = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		btnAdd = (Button) findViewById(R.id.btnAdd);
		btnClear = (Button) findViewById(R.id.btnClear);
		expList = (ExpandableListView) findViewById(R.id.expList);

		btnAdd.setOnClickListener(listener);
		btnClear.setOnClickListener(listener);

		// 设置点击子条目时触发事件
		expList.setOnChildClickListener(childClickListener);
		// 设置长按时的事件
		registerForContextMenu(expList);
		showData();

	}

	// 显示数据
	public void showData() {
		studentDao = (studentDao != null ? studentDao : new StudentDaoImpl(
				MainActivity.this));
		List<GroupChild> data = studentDao.getData();
		SimpleExpandableListAdapter adapter = GroupChildUtil.buildAdapter(this,
				data);

		expList.setAdapter(adapter);
	}

	OnClickListener listener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			studentDao = (studentDao != null ? studentDao : new StudentDaoImpl(
					MainActivity.this));
			classesDao = (classesDao != null ? classesDao : new ClassesDaoImpl(
					MainActivity.this));

			switch (v.getId()) {
			case R.id.btnAdd:
				toastShow("初始化");

				Classes classes = new Classes();
				classes.setName("五期提高班");
				Long classid1 = classesDao.insert(classes);

				Student student1 = new Student();
				student1.setName("lk");
				student1.setClassesId(classid1.intValue());
				studentDao.insert(student1);

				Student student2 = new Student();
				student2.setName("cls");
				student2.setClassesId(classid1.intValue());
				studentDao.insert(student2);

				Student student3 = new Student();
				student3.setName("lb");
				student3.setClassesId(classid1.intValue());
				studentDao.insert(student3);

				Classes classes2 = new Classes();
				classes2.setName("六期提高班");
				Long classid2 = classesDao.insert(classes2);

				Student student4 = new Student();
				student4.setName("jzg");
				student4.setClassesId(classid2.intValue());
				studentDao.insert(student4);

				Student student5 = new Student();
				student5.setName("lxy");
				student5.setClassesId(classid2.intValue());
				studentDao.insert(student5);

				break;
			case R.id.btnClear:
				toastShow("清空");
				String sql1 = "delete from t_student";
				String sql2 = "delete from t_classes";
				studentDao.execSql(sql1, null);
				classesDao.execSql(sql2, null);
				break;
			default:
				break;
			}

			showData();
		}
	};

	// 封装Toast,一方面调用简单,另一方面调整显示时间只要改此一个地方即可.
	public void toastShow(String text) {
		Toast.makeText(MainActivity.this, text, 3000).show();
	}

	// 长按出现的菜单
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		menu.setHeaderTitle("请选择操作");
		menu.add(0, ITEM_MODIFY, 0, "编辑");
		menu.add(0, ITEM_DELETE, 1, "删除");
	}

	@Override
	public boolean onContextItemSelected(MenuItem item) {
		ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item
				.getMenuInfo();

		int type = ExpandableListView
				.getPackedPositionType(info.packedPosition);
		// 子条目
		if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
			String childId = ((TextView) info.targetView
					.findViewById(R.id.childIdTo)).getText().toString().trim();
			if (TextUtils.isEmpty(childId) || "0".equals(childId)) {
				toastShow("childId为空,不可编辑和删除!");
				return false;
			}
			String childName = ((TextView) info.targetView
					.findViewById(R.id.childNameTo)).getText().toString()
					.trim();
			studentDao = (studentDao != null ? studentDao : new StudentDaoImpl(
					MainActivity.this));
			switch (item.getItemId()) {
			case ITEM_MODIFY:

				Student student = studentDao.get(Integer.parseInt(childId));
				student.setName("李坤");
				studentDao.update(student);
				toastShow("修改[" + childName + "]");
				break;
			case ITEM_DELETE:
				studentDao.delete(Integer.parseInt(childId));
				toastShow("删除[" + childName + "]成功!");
				break;
			default:
				return false;
			}
			showData();
			return true;
			// 组
		} else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
			String groupId = ((TextView) info.targetView
					.findViewById(R.id.groupIdTo)).getText().toString().trim();
			if (TextUtils.isEmpty(groupId) || "0".equals(groupId)) {
				toastShow("groupId为空,不可编辑和删除!");
				return false;
			}
			String groupName = ((TextView) info.targetView
					.findViewById(R.id.groupNameTo)).getText().toString()
					.trim();
			classesDao = (classesDao != null ? classesDao : new ClassesDaoImpl(
					MainActivity.this));
			switch (item.getItemId()) {
			case ITEM_MODIFY:
				Classes classes = classesDao.get(Integer.parseInt(groupId));
				classes.setName("五期信息技术提高班");
				classesDao.update(classes);
				toastShow("修改组[" + groupName + "]");
				break;
			case ITEM_DELETE:
				classesDao.delete(Integer.parseInt(groupId));
				toastShow("删除组[" + groupName + "]成功!");
				break;
			default:
				return false;
			}
			showData();
			return true;
		}

		return true;
	}

	// 子条目上的点击事件
	OnChildClickListener childClickListener = new OnChildClickListener() {

		@Override
		public boolean onChildClick(ExpandableListView parent, View v,
				int groupPosition, int childPosition, long id) {
			String childId = ((TextView) v.findViewById(R.id.childIdTo))
					.getText().toString();
			String childName = ((TextView) v.findViewById(R.id.childNameTo))
					.getText().toString();
			HashMap groupMap = (HashMap) expList.getExpandableListAdapter()
					.getGroup(groupPosition);

			toastShow("学号:" + childId + ";学生姓名:" + childName + ";班号:"
					+ groupMap.get(GroupChildUtil.groupIdFrom).toString()
					+ ";班名:"
					+ groupMap.get(GroupChildUtil.groupNameFrom).toString());

			return true;
		}
	};
}

ExpandableListView实例(一)_数据库增删改查处理和listitem点击长按处理
http://blog.csdn.net/lk_blog/article/details/7562987

ExpandableListView实例(二)_两种方式实现QQ中组后面显示子条目数量效果
http://blog.csdn.net/lk_blog/article/details/7563355

ExpandableListView实例(三)_实现QQ中"未分组"效果和"未分组"不可编辑删除功能
http://blog.csdn.net/lk_blog/article/details/7563371


源代码下载地址: http://download.csdn.net/detail/lk_blog/4299729